import {Singleton, Inject} from "../di";
import {CanonicalRecursive} from "./CanonicalRecursive";
import {Logging} from "./Logging";

/**
 * Canonical unit that loads configuration files from `app/configs`.
 */
@Singleton()
export class Config extends CanonicalRecursive {
    @Inject()
    protected readonly logging!: Logging

    protected appPath: string[] = ['configs']
    protected suffix: string = '.config.js'
    protected canonicalItem: string = 'config'

    /** If true, all the unique configuration keys will be stored for debugging. */
    protected recordConfigAccesses: boolean = false

    /** Array of all unique accessed config keys, if `recordConfigAccesses` is true. */
    protected accessedKeys: string[] = []

    public async up() {
        await super.up()

        if ( this.get('server.debug', false) ) {
            Error.stackTraceLimit = Infinity
            this.recordConfigAccesses = true
        }
    }

    public async down() {
        await super.down()

        if ( this.recordConfigAccesses && this.accessedKeys.length ) {
            this.logging.debug(`The following configuration keys were accessed while this application was online:`)
            this.accessedKeys.forEach(key => this.logging.debug(`    - ${key}`))
        }
    }

    public get(key: string, fallback?: any): any {
        if ( this.recordConfigAccesses && !this.accessedKeys.includes(key) ) {
            this.accessedKeys.push(key)
        }

        return super.get(key, fallback);
    }
}